Mini Assassin Derringer (TOY 1 & 2 shots versions)

I saw this https://www.thingiverse.com/thing:492258 (Thanks Peter Alaric for the Idea) and wanted to make a modern mechanical version of it, so I combined this https://www.thingiverse.com/thing:2982607 to make the Mini Assassin Derringer.
!! I blocked the barrel and removed the firing pins so THIS IS ONLY A MECHANICAL TOY & does not fire anything.
Trigger & Hammer Springs: https://www.ebay.co.uk/itm/10mmx6mmx19mm-Metal-Taper-Conical-Compression-Spring-Silver-Tone-45pcs/302341785057?epid=943276